The　warm　mix　asphalt　was　fabricated　with　different　moisture　contents　(0%,　1%,　2%,　and　3%)　of　limestone　aggregates　using　the　Superpave　gyratory　compactor.　The　moisture　susceptibility　of　asphalt　mixtures　with　an　organic　wax　additive　RH　was　studied.　The　samples　were　compacted　and　tested　using　the　modified　Lottman　test　AASHTO　T283,　and　the　X-ray　computed　tomography　technology　was　used　to　capture　the　internal　structure　images　before　and　after　the　freeze-thaw　cycles.　The　test　results　show　that　the　air　voids　were　distributed　in　the　size　range　of　0-5mm(3)　and　5-10mm(3).　The　number　of　air　voids　decreased　with　the　increase　of　air　void　size　and　increased　after　freeze-thaw　cycles.　The　air　void　content　can　be　influenced　by　the　residual　moisture　in　aggregates.　The　higher　the　moisture　content　of　aggregates　is,　the　larger　the　air　void　content　is.　So,　the　air　void　content　is　likely　to　be　sensitive　to　moisture　damage.　The　increase　ratio　of　the　air　void　and　moisture　content　of　aggregates　had　good　correlation　with　the　indirect　tensile　strength　and　tensile　strength　ratio　of　the　samples.　The　indirect　tensile　strength　and　tensile　strength　ratio　of　the　samples　decreased　linearly,　and　the　samples　were　sensitive　to　the　moisture　damage　with　the　increases　of　increase　ratio　of　the　air　void/moisture　content　in　aggregates.